I think who we trade for comes down to the Final Days of the trade deadline. Only then will costs be actually determined... all is talk and jockeying until then. If the price is right for a need, Move, if not Stay Put.
And then there are the August chances to get a waivers guy.
I think unless the Yanks are like 9 games behind at month's end, they do make a big move (can now include Gary Sanchez) Otherwise, they stay put, hang on to their big prospects, and concentrate on winning the Play-In game.